class A {
  double f(double x, double y){
    return x+y;
  }
}
class B extends A{
  double f(int x,int y){
    return x*y;
  }
}
public class xiti5_1{
  public static void main(String args[]) {
    B b = new B();
    System.out.println(b.f(3,5));
    System.out.println(b.f(3.0,5.0));
  }
}
